Bobbin-holder.



110.860.933. PATENTED JULY 23, 1907.

T. J. MURDOGK.

' BOBBIN HOLDER. AP-PLIATION FILED APB. 15. 1905.

UNITED vSTATES PATENT OFFICE.

THOMAS I. MURDOOK, OF FRANKLIN, MASSACHUSETTS, ASSIGNOR TO MURDOOK AND GEB COMPANY, OF FRANKLIN, MASSACHUSETTS.

BOBBIN-HOLDER.

Specification of Letters Patent.

Patented July 23, 1907.

Application-filed April l5, 1905. Serial No. 255,730.

To all whom it 'may concern: v

Be it known that I, THOMAS J. MURDoci, a citizen of the United States, residing at Franklin, in the county oi' Norfolk and State of Massachusetts, have invented a new and useful Improvement in Bobbin-Holders, ol' which the following is a specification.

This invention has reference to an improvement in bobbin holders used for frictionally securing bobbins to the spindles of mules or other spinning machines.

In bobbin holders as heretofore constructed the coiled spring for holding the jaws in the closed position on the head of the bobbin is placed above the pivot of the jaws. In practice this has been found to be detrimental or as the spindle gained in speed the centrifugal force would tend to open the jaws and spring and loosen or release the bobbin.

The object of my invention is to improve the construction oi bobbin holders, whereby the lower' ends of the jaws of the holder are over-weighted and the springs i'or holding the jaws in the closed position are placed below the pivot of the jaws.

A further object of my invention is to simplify the construction of bobbin holders, thereby reducing the cost of manufacturing the same.

My invention consists in the peculiar and novel construction of a bobbin holder having a plurality oi overweighted'jaws, springs placed below the pivot oi the jaws adapted to engage with the over-weighted lower end of the jaws and hold the jaws in the closedposition under spring tension, and other details of construction, as will be more ully set forth hereinaiter.

Figure l is a side view of a mule spindle, showing a bobbin rictionally secured to the spindle by my improved bobbin holder. Fig. 2 is a top view of the holder with the bobbin removed from the holder. Fig. 3 is a view o the holder looking at the underside of the same. Fig. 4 is a vertical sectional view taken on line X X of Fig. 3 through the head of the bobbin and the holder. Fig. 5 is an enlarged detail view of part of the holder frame, showing one of the openings for the clamping jaws. Fig. 6 is an enlarged detail sectional view through the holder frame taken on line Y Y oi Fig. 5, and Fig. 7 is an enlarged detail sectional view of part oi aclamping jaw and the end oi a spring, showing the means of attaching the end oi the spring to the lower over-weighted end of the jaw.

In the drawings, a indicates a spindle, and b a bobbin having the circular head b/ and the usual central hole for the spindle.

My improved bobbin holder consists o a circular l'ranie c having the downwardly-turned annular lip c, the central hole c2 and the curved openings c3 c3 in the top oi the frame adjacent the edge. These openings c' cK are shaped to receive the clamping jaws of the holder. From the inner edges oi the openings c3 cis tongues c4 oi the metal extend toward the center of the said openings. These tongues are flexible and may be bent substantially at right angles to the body of the circularl frame. In Figs. 5 and 6 the tongues are shown in full lines in their Hat or normal position, that is bent G0 down, and in dotted lines in their bent up position. The tongues are bent up and the clamping jaws are inserted in the openings c3 c3 and the tongues c4 c4 are then bent down to hold the clamping jaws in their operative position in the frame. A collar c5 having the end 65 c reduced in size to form a shoulder is secured to the irame c by passing the end c6 through the central hole c2 in the frame and upsetting the end cG onto the frame,

as shown in Fig. 4. Each oi the clamping jaws d d are constructed to have the outwardly-curved upper end (lf, the inwardly and downwardly bent central portion forming the shoulder cl2 and the enlarged over-weighted lower end d3 on the inner side oi which are raised circular lips forming the depressions d.'4 d4, as shown in Fig. 7. These depressions are made by rst stamping up from the outside a cup-shaped depression and then stamping the bottom of the cup shaped depression back from the inside. The clamping jaws d d are also shaped to conform to the circular frame c, as shown in Figs. 2 and 3. The curved wire springs e e each have the outwardly-bent ends e e, as shown in Fig. 7.

In assembling my improved bobbin holder the clamping jaws d d are inserted upward through the openings c3 c3 in the frame c and the tongues c4 c4 bent down to pivotally secure the jaws in the frame. The wire springs are now placed into position by contracting the spring and snapping the ends e/ ef of the springs into the depressions d4 d4 in the lower ends o the locking jaws. One end oi a spring enters a depression in a jaw and the other end enters a depression in the adjacent jaw, as shown in Fig. 3, thus bringing the springs under the pivot of the jaws. The holder is now secured by forcing the collar c5 onto the spindle, as shown in Fig. 4.

By this construction and arrangement of the parts the tension of the springs e e exerts an outward pressure on the lower ends of the clamping jaws and an inward pressure on.the upper ends of the jaws, thus firmly holding the bobbin on the spindle, and this tension of the springs is materially assisted by the over-weighted lower ends of the jaws when the spindle is ruiming at its maximum speed.

Having thus described my invention, I claim as new and desire to secure by Letters Patent;

of curved openings adjacent its periphery and a central hole, a collar secured to the frame in the central hole, a series of clamping jaws having enlarged over-weighted lower ends in the inner' face of which are depressions, means for pivotally securing the clamping jaws in the curved openings in the frame, and means for exerting a spring tension on the lower ends of the jaws below the pivot of the same, consisting of curved wire springs the ends of which enter the depressions in adjacent jaws, as

described.

3. In a bobbin holder, the combination of a circular frame c having the downwardly-turned annular lip c, the central hole c2, the curved openings e 0 adjacent the edge .and the tongues o'L c4 on the inner edge of the openings hole c2 by upsetting the end c onto the frame, clamping jaws d d pivotally secured in the openings crs ca by the tongues c4 c4 each jaw having the outwardly-curved upper end d', the shoulder d2, the enlarged over-weighted lower end Z3 on the inner side of which are the depressions d* d", and the curved wire springs e e each spring having the outwardly-bent ends o e adapted to enter the depressions (Z4 d4 in the jaws and exert a spring tension on the jaws below the pivot of the same. as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

THOMAS il. MURDOCK. Witnesses:

ADA E. HAGERTY, J. A. MILLER, Jr. 

